Transcript
8MB400
High Output Midbass Ferrite Transducer
Key Features 98 dB SPL 1W / 1m average sensitivity 51 mm (2 in) Interleaved Sandwich Voice coil (ISV) 280 Watt continuous pink noise power handling Weather protected cone Ideal for compact two way and multiway systems Improved heat dissipation via unique basket design
The 8MB400 transducer has been developed in response to a specific market requirement for a 8” midbass driver which combines excellent linearity with good efficiency and power handling capabilities. It is primarily intended for use as a midbass driver in compact 2-way reflex enclosures with a 1” compression driver or tweeter but as a result of its versatile characteristics, it can also be used in multiway systems. The curvilinear, paper cone is formed using a unique wood pulp composition designed to achieve the best possible rigidity and stiffness. This is carried by a polycotton multiroll surround to provide increased excursion whilst controlling break up modes. The 50 mm Ø state-of-the-art, aluminum wire voice coil employs the same technology fitted to our top-of-the-range models, i.e. our Interleaved Sandwich Voice coil (ISV) technology. It is composed of a high strength fiberglas former carrying windings on both the outer and inner surfaces to achieve a mass balanced coil. This results in an extremely linear motor assembly which, in conjunction with the highly advanced design of the magnetic structure, provides a high force factor or BL. The voice coil is cooled by incorporating airways between the chassis back plate and the magnetic top plate to channel heated air away from the voice coil and gap and dissipate it. In-house FEA CAD facilities have been used to optimise flux density and BL factor within the air gap. Due to the increasing use of sound systems at outdoor events, the 8MB400’s ability to perform in humid environments is a key feature. This has been achieved using an exclusive cone treatment which renders the cone resistant to humidity.
0220865410 16 Ohm 0220885410 8 Ohm 0220845410 4 Ohm
FERRITE LF-MB-MF TRANSDUCERS
General Description
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FERRITE LF-MB-MF TRANSDUCERS
8MB400
High Output Midbass Ferrite Transducer
NOMINAL DIAMETER RATED IMPEDANCE CONTINUOUS PINK NOISE (1) CONTINUOUS POWER (2) PROGRAM POWER (3) PEAK POWER (4) SENSITIVITY (5) FREQUENCY RANGE (6) POWER COMPRESSION @-10DB (7)
200 mm (8 in) 8 Ohm 280 W 200 W 400 W 800 W 95 dB 55 ÷ 5200 Hz (20 W) 0,5 dB
POWER COMPRESSION @-3DB POWER COMPRESSION @FULL POWER
(100 W) 1,4 dB (200 W) 2,3 dB
MAX RECOMM. FREQUENCY RECOMM. ENCLOSURE VOLUME MINIMUM IMPEDANCE MAX PEAK TO PEAK EXCURSION VOICE COIL DIAMETER VOICE COIL WINDING MATERIAL POLARITY
3000 Hz 10 ÷ 40 lt. (0,35 ÷ 1,41 cuft) 6,1 Ohm at 25°C 19 mm (0,75 in) 51 mm (2,00 in) aluminum positive voltage on red terminal gives forward cone motion
FREQUENCY RESPONSE CURVE OF 8MB400 MADE ON 25 LIT. ENCLOSURE TUNED 65HZ INFREE FIELD (4PI) ENVIRONMENT. ENCLOSURE CLOSES THE REAR OF THE DRIVER. THE THIN LINE REPRESENTS 45 DEG. OFF AXIS FREQUENCY RESPONSE
FREE AIR IMPEDANCE MAGNITUDE CURVE
THIELE SMALL PARAMETERS (8) Fs Re Sd Qms Qes Qts Vas Mms BL Linear Mathematical Xmax (9) Le (1kHz) Ref. Efficiency 1W@1m (half space)
64 Hz 5 Ohm 0,0227 sq.mt. (35,19 sq.in.) 3,23 0,43 0,38 23,9 lt. (0,85 cuft) 18 gr. (0,04 lb) 9,3 Tm ± 5,8 mm (± 0,23 in) 0,96 mH 93,7 dB
MOUNTING INFORMATIONS Overall diameter N. of mounting holes Mounting holes diameter Bolt circle diameter Front mount baffle cutout ø Rear mount baffle cutout ø Total depth Flange and gasket thickness Net weight Shipping weight CardBoard Packaging dimensions
210 mm (8,27 in) 6 6 mm (0,23 in) 195 - 198 mm (7,68 - 7,80 in) 186 mm (7,32 in) 184 mm (7,24 in) 99,5 mm (3,92 in) 14,5 mm (0,57 in) 3,6 kg (7,95 lb) 3,92 kg (8,65 lb) 235 x 235 x 150 mm (9,25 x 9,25 x 5,91 in)
NOTES (1) AES standard (2) Continuous power rating is measured in 25 lit enclosure tuned 65Hz using a 60 - 2000Hz band limited pink noise test signal applied continuously for 2 hours. (3) Program power rating is measured as for 2 above but 50% duty cycle. (4) The peak power rating is based on a 6dB crest factor above the continuous power rating and represents the maximum permitted instantaneous peak power level over a maximum period of 10ms which will be withstood by the loudspeaker without damage. (5) Sensitivity represents the averaged value of acoustic output as measured on the forward central axis of cone, at distance 1m from the baffle panel, when connected to 2,83V sine wave test signal swept between 500Hz and 2500Hz with the test specimen mounted in the same enclosure as given for 2 above. (6) Frequency range is given as the band of frequencies delineated by the lower and upper limits where the output level drops by 10 dB below the rated sensitivity in half space environment. (7) Power compression represents the loss of sensitivity for the specified power, measured from 50-500 Hz, after a 5 min pink noise preconditioning test at the specified power. (8) Thiele - Small parameters are measured after the test specimen has been conditioned by 280 W AES power and represent the expected long term parameters after a short period of use. (9) Linear Mat. Xmax is calculated as; (Hvc-Hg)/2 + Hg/4 where Hvc is the coil depth and Hg is the gap depth.
EIGHTEEN SOUND - Via dell'Industria 20 - 42025 Cavriago Italy - Tel. +39 0522 494402 - Fax +39 0522 494410
Eighteen Sound engages in research and product improvement. New materials and design refinements can be introduced into existing products without notice.
GENERAL SPECIFICATIONS
